Sally's adolescent classmates call her and the other 125 members of her advanced computer software group "nerds," meaning she is part of a

Research on sibling relationships in African-American families indicates that these relationships are most positive when children have a. many siblings

b. high IQs. c. sisters. d. a strong sense of ethnic identity.

You are baffled about how to untangle the influence of heredity and environment on intelligence. According to your text, you should ____.?

a. ?do a longitudinal study where you give people IQ tests every two years from infancy to early adulthood b. ?calculate the IQ of parents and their offspring, which would show the influence of the environment c. ?measure and compare the IQs of identical twins, of fraternal twins, and of siblings reared either together or separately d. ?map the genes responsible for intelligence